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CVE-2026-80890

Unknown

Last modified

CVE-2026-80890 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association.

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent. The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association. Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < f6e3cc296372accad4ee57405195021231ef4bcb; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c151daba0ceb1fb068a215b07de89fb1eb5f87bc; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 817cffdbdbdf50e1f2b016599d1897de3ca54964; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 61baa5020b0afb41bfd97f8f6ce5e336c4a4546e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c68557a49e960dbcdede22c7a9b488603078b8b4; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a0d1693923f41d6f49083aa2446686aed09d1d79; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 35c279113498d19a8734e2aae67b951b9b20f634; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9d8da8e0a9bce4a340af60dd0446bc7eb8d07587
LinuxLinux2.6.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80890?
In the Linux kernel, the following vulnerability has been resolved: sctp: reject stale cookies with mismatched verification tags sctp_unpack_cookie() skips cookie expiration checks whenever an association already exists. This is broader than the exception in RFC 9260 Section 5.2.4. For an existing association, Section 5.2.4 permits an expired State Cookie only when both Verification Tags in the cookie match the current association. Otherwise, the packet SHOULD be discarded and a Stale Cookie ERROR MUST be sent. The broad check lets an expired Action A restart cookie reach sctp_sf_do_dupcook_a(). In a runtime test with the default 60 second cookie lifetime, replaying such a cookie after 65 seconds returned a COOKIE-ACK and restarted the association. Check cookie expiration unless both Verification Tags match. This preserves the Action D exception for a lost COOKIE ACK while rejecting expired cookies in all other cases.
How severe is CVE-2026-80890?
Severity scoring for CVE-2026-80890 is pending analysis.
How do I fix CVE-2026-80890?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST